Unix Commands

cd

change directory to specified path

pwd

print current working directory

mkdir

create new directory

ls

lists files and directories

grep

used to search for specific patterns or regular expressions in text files or streams and display matching lines.

man

displays user manual for given command or topic

apropos

searches ‘name‘ in all manual pages for a specified keyword

ps

Display running processes

kill

terminate process

top

Monitor system processes in real-time

less

allows viewing text files page-by-page

more

allows viewing text files screen-by-screen

chmod

Change file permissions

cp

copy files and directories

mv

move or rename files or directories

rm

remove files and directories

diff

compares the content of two files line-by-line

sort

Prints input or concatenation of files given in sorted order

wc

Prints statistics of file: newline count, word count, byte count

find

search for files and directories

.

current directory

..

parent directory

~

home directory

-owner-group-anyone

file permissions: ie the rwx permision

chmod a + r

permission: files readable by all

chmod u + rwx

permission: user is given all permissions

chmod g - rwx

permissions: removes all permissions from owner’s group

chmod o - w

permissions: remove write acsess for other users